GCSE level chemistry exam revision notes INDEX for Reversible Reactions, Chemical Equilibrium, Ammonia Synthesis by the Haber Process and Nitric acid, their Manufacture and Uses, Fertilisers, Nitrogen Cycle

[Author © Dr Phil Brown PhD: Doc Brown's chemistry exam revision notes suitable for students of UK GCSE Science level AQA, Edexcel, OCR, WJEC and CCEA GCSE chemistry courses, ~US grades 9-10 chemistry [4_74revNH3- page updated April 24th 2026 *]

Equilibrium and ammonia pages index

Part A Reversible Reactions

Part B Reversible reactions and chemical equilibrium

Part C The Haber Synthesis of ammonia - nitrogen fixation

Part D(a) Manufacture & uses of ammonia-nitric acid-fertilisers & preparation of ammonium salts

Part D(b) Use of NPK fertilisers and environmental problems

Part E The nitrogen cycle

Online quizzes

Foundation tier (easier) multiple choice QUIZ on ammonia, nitric acid and fertilisers etc.

Higher tier (harder) multiple choice QUIZ on ammonia, nitric acid and fertilisers etc.

Simple quiz on the basics of reversible reactions

A more testing quiz on reversible reactions and chemical equilibrium

Word-fill quiz "Reversible Reactions and Chemical Equilibrium"

Word-fill quiz "The Synthesis and Uses of Ammonia and Fertilisers"

Combined QUIZ on rates of reaction, reversible reactions and equilibrium - Le Chatelier's Rules

See also Rates of Reaction Notes

Advanced A Level Notes on Chemical Equilibrium (use indexes)

Advanced A Level Chemistry Notes p-block elements including nitrogen & ammonia

1. Reversible Reactions - Introduction

1a The thermal decomposition of ammonium chloride

1b The thermal decomposition of hydrated copper(II) sulphate

1c The reaction of bismuth chloride with water

1d The formation and decomposition of ammonia

1e The formation and hydrolysis of an ester

Now all in PART A

2. Reversible reactions and Equilibrium

(a) The formation of calcium oxide (lime) & carbon dioxide from calcium carbonate (limestone)

(b) The formation of hydrogen chloride from hydrogen and chlorine

(c) The formation of ammonia (see section 3. below)

Now all in PART B

3. The Synthesis of ammonia - The Haber Process

Now all in PART C

4. The Uses of Ammonia

4(a) Ammonia is used to manufacture nitric acid

4(b) Ammonia is used to manufacture 'artificial' nitrogenous fertilisers

5. Problems with using 'artificial' fertilisers

Now all in PART D

6. The Nitrogen Cycle

Now all in PART E

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